Penguins are a group of aquatic flightless birds. They live almost exclusively in the Southern Hemisphere, with only one species, the Galapagos penguin, found north of the equator. Highly adapted for life in the water, penguins have countershaded dark and white plumage, and their wings have evolved into flippers.

Shark skeletons are very different from those of bony fish and terrestrial vertebrates. Sharks and other cartilaginous fish (skates and rays) have skeletons made of cartilage and connective tissue. Cartilage is flexible and durable, yet is about half the normal density of bone.

𝐻𝒶𝓋𝑒 𝒶𝓃 𝒶𝓂𝒶𝓏𝒾𝓃𝑔 𝓌𝑒𝑒𝓀𝑒𝓃𝒹 𝒶𝓃𝒹 𝒽𝒶𝓅𝓅𝓎 𝑒𝒶𝓈𝓉𝑒𝓇!

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